Tame? I'm married. What do you think?
No, we possess the basic science and the most rudimentary engineering with respect to this system right now. In five to ten years however, that may change.
But Manifest Destiny was a different time and place; the world was still under the Kiplingesque white man's burden (read, superiority and dominance) zeitgeist because the Kiplingesque held the power. And, expansion was easier as the people expanded against had no ability to exert back even an equal pressure. That has all changed... for America.
Now, we face a form of manifest destiny in he hearts of the Muslims, the Pink Chinese (well, they ain't 'xactly red anymore, and they still aren't liberal democrats [in the textbook sense, not Dynaverse H&S sense], and maybe even the East Indians.
I am of complete Chinese descent myself, but I must still stand my ground that all these other forces in the world do not bode well for humanity and that the hope for a decent if not even better sociopolitical future for humanity lies with the continued dominance of America. No offense, but Canada does not project the amount of force to coerce the geopolitical rogues to heel or even pay attention; otherwise, Canukistan isn't such a world actor, either. North America is politically healthier in a moral way (does that make sense?) than just about any other spot on this sorry globe.